UK gangs are keeping "scoreboards" of knife and gun violence as part of a brutal game fuelled by YouTube videos in which they brag about their crimes.

Points are given for the severity of the injuries inflicted and the location on the body.

A YouTube spokesperson said:

“We have developed policies specifically to help tackle videos related to knife crime in the UK and are continuing to work constructively with experts on this issue.

"We have a dedicated process for the police and the Prison Service to flag videos directly to our teams because we often need specialist context from law enforcement to identify real-life threats.

"Along with others in the UK, we share the deep concern about this issue and do not want our platform used to incite violence.”

Sky's Jason Farrell explains.

SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews

Follow us on Twitter: https://twitter.com/skynews

Like us on Facebook: https://www.facebook.com/skynews

Follow us on Instagram: https://www.instagram.com/skynews

For more content go to http://news.sky.com and download our apps:

Apple: https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8

Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB